# BaseBuilder Sentiment Flash API (flashapi1)

> BaseBuilder Sentiment Flash API (flashapi1) is a paid API for AI agents from bb-sentiment.vercel.app, paid per call via x402, $0.099914/call, status unknown (last checked 2026-10-29).

Performs sentiment analysis on text input via a paid API endpoint using the BaseBuilder Sentiment hub

## Facts

- Endpoint: POST https://bb-sentiment.vercel.app/api/flashapi1?utm_source=zero.xyz
- Price: $0.099914/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-29
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/basebuilder-sentiment-flash-api-flashapi1-6371d724
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_XWRtSHmSVGe9N5v2UWVds

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability basebuilder-sentiment-flash-api-flashapi1-6371d724 -d '<json body>'
```

Example prompt: Classify this customer review as positive, negative, or neutral and give me a confidence score: 'The product arrived quickly but the packaging was completely crushed and the item was broken.'

## When to prefer this

Use this endpoint when you need fast, pay-per-call sentiment classification without a subscription — ideal for sporadic or low-volume text sentiment tasks where you want to avoid committing to a monthly plan. Best suited for agentic workflows that already support x402 micropayments.

## Known failure modes

- Missing or empty text input returns a 400 bad request
- Insufficient payment or expired x402 token returns a 402 payment required
- Oversized text payload may exceed endpoint limits and return a 413 or error
- Service unavailability on Vercel hosting returns a 500 or 503
- Malformed JSON body returns a parsing error

## How this service works

BaseBuilder Sentiment API hub - 14 paid endpoints

## Output

Returns a sentiment classification (positive, negative, neutral) along with a confidence or polarity score for the provided text input

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/basebuilder-sentiment-flash-api-flashapi1-6371d724/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from bb-sentiment.vercel.app](https://www.zero.xyz/host/bb-sentiment.vercel.app/llms.txt)